129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
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/**********************************************************************
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Copyright (c) 1992-1998 Microsoft Corporation
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cookmap.c
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DESCRIPTION:
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Non-fixed code for doing cooked-mode output mapping.
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HISTORY:
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03/04/94 [jimge] created.
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*********************************************************************/
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#include "preclude.h"
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#include <windows.h>
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#include <windowsx.h>
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#include <mmsystem.h>
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#include <mmddk.h>
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#include "idf.h"
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#include <memory.h>
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#include "midimap.h"
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#include "debug.h"
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/***************************************************************************
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@doc internal
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@api int | MapCookedBuffer | Perform output mapping of a polymsg buffer.
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@parm PINSTANCE | pinstance | Instance owning the polymsg buffer.
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@parm LPMIDIHDR | lpmh | The buffer to map.
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@comm
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Map this buffer (which may allocate more channels to us).
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Build array of used ports and physical channels used on each port.
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Acquire shadow buffers and a sync object and set them up.
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Queue the sync object and send it if there isn't anything playing.
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@rdesc | MMSYSERR_xxx.
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***************************************************************************/
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#define SKIP_BYTES(x,s) \
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{ \
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if (cbBuffer < (x)) \
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{ \
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DPF(1, TEXT ("MapCookedBuffer: ran off end of polymsg buffer in parse! %ls"), (LPTSTR)(s)); \
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mmRet = MMSYSERR_INVALPARAM; \
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goto CLEANUP; \
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} \
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((LPBYTE)lpdwBuffer) += (x); \
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cbBuffer -= (x); \
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}
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MMRESULT FNGLOBAL MapCookedBuffer(
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PINSTANCE pinstance,
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LPMIDIHDR lpmhParent)
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{
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LPDWORD lpdwBuffer;
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DWORD cbBuffer;
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BYTE bEventType;
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DWORD dwEvent;
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DWORD dwStreamID = 0;
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MMRESULT mmRet;
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LPMIDIHDR lpmh;
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PSHADOWBLOCK psb;
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mmRet = MMSYSERR_NOERROR;
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psb = (PSHADOWBLOCK)(UINT_PTR)lpmhParent->dwReserved[MH_SHADOW];
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lpmh = psb->lpmhShadow;
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DPF(2, TEXT ("Map: pinstance %04X lpmh %p"), (WORD)pinstance, lpmh);
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lpmh->reserved = lpmhParent->reserved;
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lpmh->dwBytesRecorded = lpmhParent->dwBytesRecorded;
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lpmh->dwReserved[MH_MAPINST] = (DWORD_PTR)pinstance;
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// In-place map the buffer. Run through it, mapping all of the
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// short events.
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//
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lpdwBuffer = (LPDWORD)lpmh->lpData;
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cbBuffer = lpmh->dwBytesRecorded;
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while (cbBuffer)
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{
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SKIP_BYTES(sizeof(DWORD), TEXT ("d-time"));
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if (cbBuffer < 2*sizeof(DWORD))
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return MMSYSERR_INVALPARAM;
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bEventType = MEVT_EVENTTYPE(lpdwBuffer[1]);
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dwEvent = MEVT_EVENTPARM(lpdwBuffer[1]);
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if (bEventType == MEVT_SHORTMSG)
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{
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dwEvent = MapSingleEvent(pinstance,
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dwEvent,
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MSE_F_RETURNEVENT,
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(DWORD BSTACK *)&dwStreamID);
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lpdwBuffer[0] = dwStreamID;
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lpdwBuffer[1] = dwEvent;
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}
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SKIP_BYTES(sizeof(DWORD), TEXT ("stream-id"));
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SKIP_BYTES(sizeof(DWORD), TEXT ("event type"));
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if (bEventType & (MEVT_F_LONG >> 24))
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{
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dwEvent = (dwEvent+3)&~3;
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SKIP_BYTES(dwEvent, TEXT ("long event data"));
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}
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}
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mmRet = midiStreamOut(ghMidiStrm, lpmh, sizeof(MIDIHDR));
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CLEANUP:
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return mmRet;
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}
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